Looks pretty good, but as mentioned, uses bitmap (picture) topo maps so size requirements can be huge.
My setup starts with a
Garmin GPSMap 276c in the Trailblazer, which uses vector (line based) maps. With some memory expansion I can load both driving maps (hotels, gas, points of interest, etc.) and topo maps. I also decided on this because a local company makes 1:10,000 topo maps of Ontario for Garmin.
As Roadie mentioned before, the one problem with this setup is that even though the screen is 480x360, its still is too small when you want to see the big picture or plan for distances (a la MORA extraction).
I have looked into the Toughbooks from time to time but their cost was always prohibitive.
Once I get home, I download everything to the Garmin Roadtrip desktop software on my Mac. I started using this out of necessity but it has grown on me. It can display any of the vector-based maps I currently own (City Navigator NA, TopoUSA 100K, Topo Ontario 10K). I see that Garmin is growing their 24K US topo maps (from west to east), so I will probably start to get those as well.
But since the home computer has unlimited space, I have been on the lookout for really good looking bitmap based maps so that when I overlay my tracks, I can output a graphic that looks better than what I currently do with the vector based ones. The National Geographic set looks promising but pricey again as they sell them by state.
AG